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North Macedonia, officially the Republic of North Macedonia, is a landlocked country in Southeast Europe. Its terrain is mostly rugged, located between the Šar Mountains and Osogovo, which frame the valley of the Vardar River. Three large lakes - Lake Ohrid, Lake Prespa, and Dojran Lake - lie on the southern borders, bisected by the frontiers with Albania and Greece. Ohrid is considered one of the world's oldest lakes and biotopes.

Albania, officially the Republic of Albania, is a country in Southeastern Europe. The country is located in the Balkans on the Adriatic and Ionian Seas within the Mediterranean Sea. Albania has a variety of climatic, geological, hydrological, and morphological conditions. Albania boasts a significant diversity, with the landscape ranging from the snow-capped mountains in the Albanian Alps and the Korab, Skanderbeg, Pindus, and Ceraunian Mountains, to the hot and sunny Albanian Adriatic and Ionian Sea Coasts.

Kolotar, 4 October 2010. The acute toxic risk deriving from the heavy metals in the red sludge is rather low, as their concentrations are rather low. However, the chronic toxicity threat is high.

The Accident Emergency Warning System (AEWS) of the Danube River Basin is activated whenever there is a risk of transboundary water pollution, or threshold danger levels of certain hazardous substances are exceeded.